Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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You have been tasked by a pharmaceutical company to generate a novel strain of Cannabis sativa for therapeutic purposes. Consider a Cannabis strain with three genes (called gene 1, gene 2 and gene 3) that are on different chromosomes and assort independently. Each gene has two alleles, described below:
- The T allele for gene 1 is dominant and associated with the trait of producing a large amounts of terpenes, and the t allele is recessive and associated with the trait of producing a low amount of terpenes
- The S allele for gene 2 is dominant and associated with the trait of fast growth, and the s allele is associated with the trait of slow growth
- The F allele for gene 3 is associated with the trait of producing large flowers, and the f allele is associated with the trait of producing small flowers
Assume that an individual plant that is heterozygous for genes 1 and 2, but homozygous ff for gene 3 self-fertilizes.
What is the probability of getting a plant that produces a large amount of terpenes, grows slowly, and produces small flowers? Explain your reasoning and show your work, if necessary.
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- A GENETICIST DISCOVERS A NEW MUTATION IN PEAS THAT CAUSES MOTTLED FLOWER COLOR. SHE CALLS THIS MUTATION SPOTTY AND DETERMINES THAT IT IS DUE TO AN AUTOSOMAL RECESSIVE ALLELE (S). SHE WANTS TO DETERMINE WHETHER THE GENE ENCODING SPOTTY IS LINKED TO THE RECESSIVE GENE FOR FLOWER COLOR (WHITE, W, IS RECESSIVE TO PURPLE). SHE CROSSES A PLANT HETEROZYGOUS FOR BOTH TRAITS WITH A PLANT HOMOZYGOUS RECESSIVE FOR BOTH TRAITS AND OBTAINED THE FOLLOWING PROGENY:NORMAL, PURPLE: 86 NORMAL, WHITE: 14 SPOTTY, PURPLE: 10 SPOTTY, WHITE: 90• WHAT ARE THE GENOTYPES FOR EACH OF THESE FOUR PROGENY TYPES?• WHICH ALLELES ARE FOUND ON EACH CHROMOSOME OF THE DOUBLE HETEROZYGOTE PARENT? (USE SLASH NOTATION.)• WHAT IS THE DISTANCE IN CM BETWEEN THESE TWO GENES?arrow_forwardIn the fruit fly, dumpy wings (d) and purple eyes (p) are encoded by mutant alleles that are recessive to those that produce wild type traits; long wings (d+) and red eyes (p+). These two genes are on the same chromosome. In a particular lab, two researchers Walt and Jesse crossed a fly homozygous for dumpy wings and purple eyes with a fly homozygous for the wild type traits. The F1 progeny, which had long wings and red eyes, was then crossed with flies that had dumpy wings and purple eyes. Unfortunately, the progeny of this cross somehow escaped. To prevent their other projects from contamination, they decided to spend an exceptionally boring hour in the lab catching and counting the progeny and found the following: long wings, red eyes – 482 dumpy wings, purple eyes – 473 long wings, purple eyes – 23 dumpy wings, red eyes - 22 What is the genetic distance between these two loci? a. 4.5 cM b. 55 cM c. 45 cM d. 49.5 cM e. 4.7 cMarrow_forwardBelow is a pedigree of a family with a history of Best disease (or vitelliform macular dystrophy). All members of this family underwent ASO testing using two different oligonucleotides (ASO 1 and ASO 2): one that hybridizes to the only known mutation that leads to Best disease and one that hybridizes to the wild-type gene sequence in the same region. From the information you have, how is Best disease most likely inherited? 1. II. III. 0 0 0 0 0 1 ? autosomal dominant autosomal recessive x-linked recessive x-linked dominant you cannot determine ASO 1 ASO 2 1-1 1-2 II-1 11-2 11-3arrow_forward
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